#include<iostream>
#include<algorithm>
#include<cstdio>

using namespace std;

const int N = 1010;
int n, m;
int v[N], w[N];
int f[N];

int main()
{

    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> v[i] >> w[i];

    for (int i = 1; i <= n; i++)
        for (int j = v[i]; j <= m; j++)
        {
     
            f[j] = max(f[j], f[j - v[i]] + w[i]);
        
        }

    cout << f[m] << endl;
    return 0;
}